Why my County OR fields only work if one is selected?

I setup a search, that everything works except the County, when more than 1 is selected. If you select no county (checkbox) or just one of the counties (checkbox) it works great, but if you select 2 or more of the 3 checkbox's, then the results are wrong.
Here is what I have for the coding.
$WADbSearch2_DefaultWhere = "";
if (!session_id()) session_start();
if ((isset($_GET["WADbSearch2"])) && ($_GET["WADbSearch2"] != "")) {
$WADbSearch2 = new FilterDef;
$WADbSearch2->initializeQueryBuilder("MYSQL","1");
//keyword array declarations

//comparison list additions
$WADbSearch2->addComparisonFromList("County","countyname","OR","=",0);
$WADbSearch2->addComparisonFromList("County","countyname2","OR","=",0);
$WADbSearch2->addComparisonFromList("County","countyname3","OR","=",0);
$WADbSearch2->addComparisonFromList("BodyOfWater","LakeAnna","AND","=",0);
$WADbSearch2->addComparisonFromList("WaterFront","waterOrientation_WF","AND","=",0);
$WADbSearch2->addComparisonFromList("WaterAccess","waterOrientation_WA","AND","=",0);
$WADbSearch2->addComparisonFromList("WaterView","waterOrientation_VW","AND","=",0);
$WADbSearch2->addComparisonFromEdit("ListPrice","minPrice","AND",">=",1);
$WADbSearch2->addComparisonFromEdit("ListPrice","maxPrice","AND","<=",1);
$WADbSearch2->addComparisonFromEdit("Bedrooms","minBeds","AND",">=",1);
$WADbSearch2->addComparisonFromEdit("Bedrooms","maxBeds","AND","<=",1);
$WADbSearch2->addComparisonFromEdit("BathsFull","minBath","AND",">=",1);
$WADbSearch2->addComparisonFromEdit("BathsFull","maxBath","AND","<=",1);
$WADbSearch2->addComparisonFromCheck("Docks","dock","1","","AND",">=","<>",1);
$WADbSearch2->addComparisonFromCheck("BasementY_N","basement","True","","AND","=","=",0);
$WADbSearch2->addComparisonFromEdit("TotalSquareFootage","minSQFT","AND",">=",1);
$WADbSearch2->addComparisonFromEdit("TotalSquareFootage","maxSQFT","AND","<=",1);
$WADbSearch2->addComparisonFromEdit("Garage_Spaces","garage_min","AND",">=",1);
$WADbSearch2->addComparisonFromEdit("Garage_Spaces","garage_max","AND","<=",1);
$WADbSearch2->addComparisonFromEdit("Levels","levels_min","AND",">=",1);
$WADbSearch2->addComparisonFromEdit("Levels","levels_max","AND","<=",1);

What am I missing?

Data assist search does not grouping in the way yo are expecting.

instead of using multiple form elements for the country, use only one multiple select list to list the countries, in data assist search, set the country criteria to a keyword type.

for the Keyword OR separator, use a comma followed by a space:
", "

for the and separator, enter:
"and "

set the name of the multiple select list to end in "[]" this will pass an array of the selections. and add the following code at line 1 to convert the array to a comma seperated list:

<?php

if($_SERVER["REQUEST_METHOD"] == "POST")     {

    foreach($_POST as $key => $val) {

        if(is_array($_POST[$key])) $_POST[$key] = implode(", ", $_POST[$key]);

    }

}

?>

Thank you very much, that did the trick!